JPH08216107A - Stapler with coating control mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exclude a clogged staple by operating an opening lever rotating in tight association with a sheath to facilitate an operation of a fastener to open the sheath. SOLUTION: A sheath 26 is separated from a head 16, and held to form a staple transfer channel 34. When a staple is clogged, a sheath opening lever 37 engaged telescopic ally with an outside of the sheath 26 is rotated around the shaft 27 as a center by gripping a handle 37h. The lever 37 has a front side plate 40 and tow side plates 41, 42. The plates 41, 42 have inner tabs 41t, 42t engaged with end walls 29W, 30W of the sheath 26 to assure rotation of the lever 37. When the lever 37 is first moved, a pin 32 brings about downward cam motion by overcoming a spring 33 by cam protrusions 41a, 42a to open the sheath 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stapler having a coating control mechanism.

[0002]

BACKGROUND OF THE INVENTION Satisfactory devices for eliminating stapler clogging have been described in, for example, US Pat. No. 5,121,86.
No. 8, No. 4,913, 332 and the like have been proposed, the present invention also provides a stapler that can easily open and approach a jammed place.

[0003]

SUMMARY OF THE INVENTION The present invention is broadly a stapler having a head and a coating, the coating being rotatable about the head by a removable clasp positioned relative to the head during operation. Retained to form staple drive channels. A release lever that pivots in close engagement with the coating acts to facilitate actuation of the clasp to release the coating and eliminate jammed staples.

[0004]

BEST MODE FOR CARRYING OUT THE INVENTION Referring to the drawings, the stapler
The frame 11, the legs 12, the upper frame 13 supporting the anvil 13a, the head 16, the staple forming tool driver unit 17, and the driver mechanism 18 are included. The folding wings 21a, 21b and the wing driver 23 are also shown. The head 16 moves upward (more generally not downward) during the cylindrical movement of the staple driver portion and has an upper surface 16s (FIG. 3) on which the staple blank cartridge is placed during operation. The cartridge 15 engages with the pin shaft 32 during operation to prevent movement of the pin shaft 32.

Referring to FIGS. 2 and 3, a pivotable sheath 26
Are shown pivoting about an axis 27 of the head 16. The coating 26 includes a front portion 28 and side portions 29, 30. The side portions 29, 30 are end wall portions 29w, 30.
have w. Each lateral portion 29, 30 has an opening 29a, 30a
2 has hooks 29h and 30h, which are engaged with the pin shaft 32 which is biased upward by the spring 33, which is the direction D in FIG. 2, and thereby held in an appropriate position. The openings 29 a and 30 a have front side inclined surfaces 29 s and 30 s that engage with the pin shaft 32, and actuate the pin shaft 32. Movement of the pin shaft 32 is limited by the upper and lower surfaces 16a, 16b of the elliptical slot 160. Under normal operating conditions, coating 26 is held away from head 16 to form staple transfer channel 34 (FIG. 3). When staple clogging occurs, the covering opening lever 37, which is telescopically engaged with the outside of the covering 26, is rotated about the shaft 27 by gripping the handle 37h. The lever 37 includes a front plate 40 and two lateral plates 41, 42. Side plate 4
1, 42 include internal tabs 41t, 42t that engage the end walls 29w, 30w of the coating 26 to ensure rotation of the lever 37. At the first movement of lever 37, pin 3
2 is overcome by the cam projections 41a and 42a against the spring 33 to cause a downward cam movement, so that the coating 2
6 is open.

When the sheath 26 is also free, it rotates about an axis 27 when biased by lever tabs 41t, 42t.

The cam projections 41a and 42a of the lever 37 are
Front side cam surfaces 41d and 42d, rear side cam surface 41, respectively
c, 42c, which are inclined and open or reverse closed by pulling the lever 37 at right angles in the DD direction. The shallow angles of the surfaces 41c, 42c, 41d, 42d facilitate pushing the pin shaft 32 in either direction. On the contrary, the cam front side inclination 29s39s of the covering 26 is
As shown in FIG. 7, it is steeper than the surfaces 41c and 42c. Direct pulling of the coating 26 requires more force and must overcome the spring 33 to depress the pin shaft 32. The vertical reference line V is the point P that first engages the coating 26 when the shaft 32 is pulled and released.
At the cam slope 30a of the hook 30h (shown by the dotted line)
Touch The lines V and W intersect at an angle b. The line R is an extension of the cam surface 42c of the lever 37. Lines V and R are angles d
Meet at. The angle b is smaller than the angle d, and the surface 30a is steeper than the surface 42c. Pulling the coating 26 to the open or open position requires more force than is being applied to the lever 37 in the practice of the invention,
The pin shaft 32 is pulled down by the cam operation to open the coating 26. During normal operation, the coating 26 is held in place by the pin shaft 32 and the cartridge 15 despite the normal stapling force applied to the coating 26. The steep slopes of the front slopes 29s and 30s are
Helps hold the coating 26 during operation of the stapler. Once released, the coating 26 is further rotated to the fully open position (FIG. 2) to inspect the channel and clear staples therein.

When the coating 26 opens wide to clear the staple jam, the forming drive unit 17 including the forming tool 42 and the driver 43 are held together by the rivets 46 attached to the forming tool 42. Rivet 46 engages driver slot 47 (FIGS. 5 and 6) to prevent molding drive unit 17 from separating. The rivet 46 holds the former 42 and the driver 43 together as a unit.

[Brief description of drawings]

FIG. 1 is a side view of the stapler of the present invention, showing the staple cartridge by dotted lines.

FIG. 2 is a partial side view of the stapler head with the coating rotated to an open position.

3 is a stapler head taken along line 3-3 of FIG. 1,
It is a partial sectional view of a coating and a coating opening lever.

4 is a stapler head taken along line 3-3 of FIG. 1,
It is a partial sectional view of a coating and a coating opening lever.

FIG. 5 is a front view of a molding tool and a driver.

6 is a cross-sectional view taken along line 6-6 of FIG.

FIG. 7 is an enlarged cross-sectional view of a part of FIG.

[Explanation of symbols]

 11 Frame 11 12 Legs 13 Upper Frame 13 13a Anvil 15 Cartridge 16 Head 17 Staple Forming Tool Driver Unit 18 Driver Mechanism 21a, 21b Bending Wings 26 Pivot Cover 28 Front Part 29, 30 Side Part 29w, 30w End Wall Part

 ─────────────────────────────────────────────────── ————————————————————————————————————————————————— Inventor Frank H. F. Lin United States New York 11356 College Point Sixth Avenue 128-15

Claims (7)

[Claims] 1. A stapler having a head and a coating disposed proximate the head to form a staple driven transfer channel and a removable staple blank cartridge for feeding staples to the channel, comprising: a) a coating. Pivot means provided on the head and the sheath for pivoting relative to the head; b) first latching means on the sheath; c) second latching means on the head for engaging the first latching means. D) A stapler with a coating control mechanism, rotatably mounted to the head, surrounding the coating and having an opening lever that engages the second latching means to open the coating when the lever rotates. 2. The stapler according to claim 1, wherein the lever engages an open coating to rotate the coating. 3. The cover has a front portion and two lateral portions at a right angle to the front portion, and the opening lever has a front portion and two lateral portions at a right angle to the front portion. The stapler according to claim 1, having a side portion. 4. The second latch means comprises an opening in the head, which has a top surface and a bottom surface, a latch pin arranged in the opening, and a spring for biasing the pin toward the top surface. The stapler according to claim 1, wherein the stapler is a stapler. 5. The first latch means includes a hook means and a pin, the hook means engaging the pin at a steep angle and requiring a first force applied to the coating to open the coating, The release lever includes a protrusion means for engaging the pin at a steep slope, and when a second force smaller than the first force is applied to the lever, the pin is pushed to open the coating. The stapler according to claim 1. 6. The stapler according to claim 1, wherein the opening lever has a handle for applying the second force. 7. The pin of claim 5, wherein the pin is held in a fixed position by the cartridge when the cartridge is loaded and allows movement of the pin when the cartridge is removed. stapler.